Granted Patent
Utility
US 6,273,123 · App. 09/419,222
Draw and return tube assembly
Inventors:
Neal L. Keefer, Kenneth A. Watson
Patented Case
View Patent ↗
Granted: Aug 14, 2001
Filed: Oct 15, 1999
Inventors
Neal L. Keefer
Kenneth A. Watson
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.